“Looking at the picture of the PK3's I wasn't expecting much. They look and feel cheap using a generic case for the drivers making them easy to fake. (In fact my first pair were fake!) these earbuds sound GREAT! Especially considering the price ($44) I have a few pair of earbuds in this same and higher price range and these PK3's knock all of them out of the water. They have a flat sounding...” --thebluebulk

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Well firstly this is not a true iem. The sound is about as great as one could get from an earbud. In my limited experience and without trying the pk1, I would say these are the finest buds you can buy. With that said, these are not for everyone, this is a niche product within an already niche market. I find driving it with my D12 anaconda makes for a pleasurable sound,...” --Jamesdeandoa

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These were my sweetest sounding head-gear yet. It would be brilliant all-rounder if it would not require a portable amp for portable use. This is the first reason i left it, otherwise i almost got an ear infection from those foams.., they get dirty in a few weeks of massive use. I recommend them to clean, i boiled them in water.
” --angevoi

PK2 earphones are the low impedance version of PK1. Although not as good as PK1, PK2's sound signature is similar to PK1. You don't have to drive PK2 with an expensive head-amp. If you are looking for something with high performance/price ratio, PK2 might be the best choice.

Athletes don't just listen to music. They use it. Introducing Portable Sport Audio by Nike and Philips, the worldwide leaders in sport and technology. These sport headphones are specifically designed for runners and riders. The behind the head design with rear cable exit improves stability and comfort. They feature soft, sweat resistant earpieces. Plus, they sound great!

Nike Sport Motion SHJ045 headphones, by Philips, features the new Nike AirPad cushions. AirPad is designed with soft ear cushions and extra large ventilating holes which provide a superb cushioning and cooling effect. The AirPad design fits comfortably in your ear allowing you to move freely without worrying about having to be continually adjusting your headphones. Headphones have a slim,...